diff --git a/Protocol2.m b/Protocol2.m
index bd184cb..7897b43 100644
--- a/Protocol2.m
+++ b/Protocol2.m
@@ -19,6 +19,7 @@
 + (Class)class { return self; }
 - (id)self { return self; }
 @end
+@implementation Protocol2 @end
 
 /**
  * This class exists for the sole reason that the legacy GNU ABI did not